Mishkat al-Masabih #938
Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «يَا بُنَيَّ إِيَّاكَ وَالِالْتِفَاتَ فِي الصَّلَاةِ فَإِنَّ الِالْتِفَاتَ فِي الصَّلَاةِ هَلَكَةٌ. فَإِنْ كَانَ لابد فَفِي التَّطَوُّع لَا فِي الْفَرْضِيَّة» . رَوَاهُ التِّرْمِذِيّ
He reported God’s Messenger as saying, “Sonny, avoid turning to the side when you are engaged in prayer, for turning to the side produces destruction. If you must do it, do it in the voluntary, but not in the obligatory prayer.”
Tirmidhi transmitted it.
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About Mishkat al-Masabih
This hadith is #938 from Mishkat al-Masabih, in the Book of Prayer.